Bobbin



NOV. 17, 1953 w. B. BROADBENT ET A1. 2,559,547

BOBBIN Filed April 2l, 1948 Patented Nov., l?, 11953 NED STATES ici:

ATENT OFFICE BOBBIN Application April 21, 1948, Serial No. 22,405

12 Claims.

This invention relates to bobbins such as are used in the textile industry as a supporting core for yarn packages, and more particularly to a twister bobbin adapted for carrying packages of synthetic yarn such as nylon, which is the familiar commercial name for the synthetic polyamide i'ilaments now being widely used in the textile industry.

in the manufacture of nylon and other synthetic yarns, it is usual practice to wind the spinneret material on bobbins in a, twister frame. The yarn shrinks after it is wound on the bobbins in this manner, and in the case of nylon, particularly, the bobbins are subjected to tremendous compressive stresses by this shrinkage, and the usual bobbin constructions are entirely inadequate to withstand these stresses. Wood bobbins, for example, are easily crushed when wound with a nylon package.

ln view of this circumstance, various metal reenforced bobbin constructions have been proposed for use in winding the synthetic yarns. In using a bobbin construction of this type, however, it has been necessary to cover the metal parts at the winding surface so as to prevent rust or corrosion which would contaminate the yarn, and this has required some arrangement for securing the covering means in place, which has resulted in relatively complicated bobbin constructions. Also, it has been diicult to provide a suitable covering for the metal reenforced bobbins having adequate Wear resistance.

According to the present invention, a twister bobbin for nylon and other synthetic yarns is provided which eliminates the above noted diniculties. The bobbin in the present invention is formed with a unitary body structure comprising a cylindrical metal barrel member and a plastic sleeve member shrunk in covering relation over the entire exterior surface of the barrel member. With this construction, the metal barrel member can be provided with adequate strength for withstanding the compressive stresses imposed by the yarn packages, and the plastic sleeve member provides an excellent smooth slick winding surface which has good wear resistance, and which, in addition, is easily buffed or ground to remove any nicks or other defects resulting from ordinary use. Also, when the plastic sleeve is damaged or worn beyond repair, it may be readily removed and replaced by a new plastic sleeve.

The bobbin of the present invention is described further below in connection with the accompanying drawing in which:

Fig. 1 is a side elevation of a bobbin formed in accordance with the invention;

Fig. 2 is a corresponding top view;

Fig. 3 is an enlarged vertical section of the bobbin shown in Fig. l;

Fig. 4 is a fragmentary sectional detail showing a modified arrangement of the sleeve member at the top of the bobbin;

Fig. 5 is a fragmentary sectional detail showing a modification in which a metal bushing is tted in the top of the bobbin;

Fig. 6 is a fragmentary sectional detail showing a modication in which the sleeve member is formed to provide a tapered driving seat at the top end of the bobbin; and,

Figs. 7 and 8 are fragmentary sectional details showing an arrangement in which the barrel member is formed to provide a protective bead at each end.

Referring rst to Figs. 1 and 2 of the drawing, the bobbin I0 of the present invention is of cylindrical form and has an uninterrupted plain smooth exterior surface. The top end of the bobbin I is arranged to receive an identification label I I as described further below.

The unitary structural arrangement of the bobbin I@ is shown more in detail in Fig. 3 in which the cylindrical metal barrel member is indicated by the reference numeral I2 and the plastic sleeve member by the reference numeral I3. As previously mentioned, the metal barrel member I2 is provided to reenforce the bobbin I0 so that it has adequate strength to withstand the compressive stresses of a wound nylon package, and the plastic sleeve member I3 is shrunk in covering relation over the entire exterior surface of the barrel member I2.

The sleeve member I3 may be arranged on the barrel member I2 in this manner by forming the sleeve I3 from plastic tubing having an inside diameter slightly smaller than the exterior diameter of the barrel member I2, and then heating the sleeve member I3 in hot water or the like to expand it sufliciently for disposition on the barrel member I2. Upon cooling, the sleeve member I 3 will shrink to a tight fast t on the barrel member I2 to provide the unitary structure characteristic of the present invention. If desired, the plastic tubing forming the sleeve member I3 may be extruded directly on the barrel member I2, or the sleeve member I 3 might also be formed or invested by dipping the barrel member I2 in molten or liquid plastic, or by spraying the plastic on the barrel member I2 as a lacquer or the like. In the usual case, we nd it desirable to form the barrel member I2 of steel and use a thermoplastic material such as acetate-butyrate for the sleeve member I3.

After the sleeve member I3 is disposed on the barrel member I2 as described above, the sleeve member I3 is formed inwardly at the bottom of the bobbin I in covering relation over the bottom end of the barrel member I2 as indicated at I4 in Fig. 3, which provides a protective cover for the ends of the barrel member I2 and thus lessens the possibility of damage to other bobbins through striking these ends during use. Similarly, at the top of the bobbin i3, the sleeve member I3 may be turned inwardly in covering relation over the top end of the barrel member I2 as shown at I5, and may be further formed to extend internally as at IS in the barrel member i2 to a terminal annular flange Il' providing a seat for the pre-f viously mentioned identification label II. The portion I6 of the sleeve member I3 extending internally in the barrel member I2 may also be formed if desired with a raised circumferential bead I8 spaced in relation to the annular flange II for retaining the identication label Ii in the seat provided by the flange 'i as illustrated in Fig. 4.

An alternative arrangement of the top end of the bobbin l for receiving the identification label i I is shown in Fig. in which a metal bushing I9 is fixed at the top of the bobbin Iil. This bushing iii is rolled as indicated at 2E! in covering relation over the top end of the barrel member I2 and is extended internally as shown at 2l in the barrel member i2 to a terminal annular flange 22 which provides a seat for the identification label I I. The portion 2| of the bushing i9 extending in ternally in the barrel member I2 is preferably dimpled as at 23 in spaced relation to the annular flange 22 for retaining the identification label II in the seat provided by the flange 22.

A further modification of the arrangement of the sleeve member I3 at the top of the bobbin IU is illustrated in Fig. 6 in which the sleeve member i3 is turned inwardly at 2d in covering relation over the top end of the barrel member I2 in the same general manner as before, but extends ine ternally in the barrel member I2 with a tapered configuration as shown at 25 which is adapted as a top driving seat for the bobbin it for use as disclosed in U. S. Patent No. 2,288,966, issued Julyf '2, 1942, te J. E. A. Blanchet. The inturned portion of the sleeve member i3 may be further formed adjacent the tapered configuration 25 with a circumferential groove 26 t0 provide a seat for the identiiication label I I.

Figs. 'l and 8 illustrate another arrangement in which the barrel member I2 extends beyond the plastic sleeve member I3 and is rolled to form an outside bead as indicated at 21 and 28 at both the top and bottom ends of the bobbin IU. This arrangement Iprovides rounded ends on the barrel member i2 which have little tendency to damage other bobbins during use, and which are very sturdy.

The bobbing construction of the present ine vention is also well adapted for use in forming spinning bob ins. In the case or" spinning bobbins the high strength factor necessary to withstand the compressive stresses imposed by nylon at the twister frame is not required, so that any light metal might be used for the bobbin barrel. The use of a metal bobbin barrel, however, provides a sturdy, serviceable bobbin construction,v while a plastic cover placed on the barrel in the nature of a sleeve, or invested by spraying or dipping as previously mentioned, provides a winding surface that will not burr or nick like metal and which is smooth and slick so that it is well suited for winding and delivery of yarn. Also, a plastic cover is easily removed from a metal bobbin barrel for replacement when it becomes worn.

We claim:

l. A bobbin adapted as a supporting core for yarn packages comprising a seamless metal barrel member invested with a seamless covering member of plastic over its entire exterior surface, one of said members extending beyond and being turned over the other at at least one end of said bobbin and thereby providing for interlocking said members.

2. A bobbin adapted as a supporting core for packages of synthetic yarn, such as nylon, and having a unitary body structure comprising a seamless cylindrical metal barrel member, and a seamless plastic sleeve member disposed tightly in covering relation over the entire exterior surface of said barrel member, one of said members extending beyond and being turned over the other at at least one end of said bobbin and thereby providing for interlocking said members.

3. A bobbin as defined in claim 2 and further characterized in that said barrel member extends beyond said sleeve member and is rolled to form an outside bead at each end of said bobbin.

4. A bobbin adapted as a supporting core for packages of synthetic yarn, such as nylon, and having a unitary body structure comprising a seamless cylindrical metal barrel member, and a seamless plastic sleeve member disposed in tightly fitting covering relation over the entire exterior surface of said barrel member, one of said members extending beyond and being turned over the other at at least one end of said bobbin and thereby providing for interlocking said members.

5. A bobbin adapted as a Supporting core for packages of synthetic yarn, suoli as nylon, and having a unitary body structure comprising a seamless cylindrical barrel member formed of steel, and a seamless sleeve member formed of a thermoplastic material disposed in tightly fitting covering relation over the entire exterior surface of said barrel member, one of said members extending beyond and being turned over the otherl at each end or said bobbin for interlocking said members.

6. A bobbin as defined in claim 4 and further characterized in that said sleeve member is formed inwardly at the bottom of said bobbin in covering relation over the bottom end of said barrel member.

7. A bobbin as defined in claim fi and further characterized in that said sleeve member is turned inwardly at the top of said bobbin in covering relation over the top end of said barrel member and extends internally in said barrel member to a terminal annular flange providing a seat for an identication label.

8. A bobbin as defined in claim 7 and further characterized in that the portion of said sleeve member extending internally in said barrel member is formed with a raised circumferential bead spaced in relation to said annular flange for retaining an identification label in the seat provided by said flange.

9. A bobbin as dened in claim 4 and further characterized in that a metal bushing is fixed at the top of said bobbin, said bushing being rolled in covering relation over the top end of said barrel member and extending internally in said barrel member to a terminal annular fiange providing a seat for an identification label, and the portion of said bushing extending internally in said barrel member being dimpled in spaced relation to said annular ange for retaining an identication label in the seat provided by said flange.

10. A bobbin as defined in claim 4 and further characterized in that said sleeve member is turned inwardly at the top of said bobbin in covering relation over the top end of said barrel member and extends internally in said barrel member with a tapered conguration adapted as a top driving seat for said bobbin.

11. A bobbin as dened in claim 10 and further characterized in that the portion of said sleeve member extending internally in said barrel member is further formed with a circumferential groove providing a seat for an identification label.

12. A bobbin adapted as a supporting core for yarn packages comprising a tubular member forming a Winding surface for said yarn packages and having an inturned end portion, said inturned end portion being formed with a terminal annular flange providing a seat for an identification label, and said inturned end portion being further formed with a circumferential groove immediately adjacent said ange for retaining an identification label in the seat provided by said ange.

WILLIAM B. BROADBENT. BOYD H. SING.

References Cited in the file of this patent UNITED STATES PATENTS Number Number Name Date Stone Feb. 9, 1886 Murphy Sept. 3, 1912 Kuttner Mar. 17, 1914 Morey May 17, 1932 Dunlap July 2, 1935 Atwood June 12, 1945 Amrhein et al Aug. 14, 1945 Morf Apr. 22, 1947 Wilson Aug. 31, 1948 Dunlap Jan. 17, 1950 FOREIGN PATENTS Country Date Germany Dec. 28, 1891 Germany June 16, 1899 Great Britain Feb. 9, 1937 

